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flap check and heat Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Wed, 8 Jan 2003 10:30:54
In Reply to: How did you check the flap->, roman, Wed, 8 Jan 2003 10:06:48 Members do not see ads below this line. - Help Keep This Site Online - Signup |
In the case of an '87, open the hood. At the base of the windshield there are two horizontal plastic covers, one on each side of the center air intake. Remove the right hand (facing forward - passenger side in US cars) cover. Sticking out of the heater box (center of the car) there is a shaft with an arm. There is a stiff wire on the arm going back through the firewall. Make sure the wire is on the arm, that the arm isn't broken off the shaft, and that when you change the heat setting the wire pulls the arm back and forth, rotating the shaft. That arm is attached to the flap. I don't think you can actually see the flap move, but the typical failure mode is for the arm to snap off the shaft, or the shaft to come off the flap. Either way, you can tell because there are parts flapping around that should be connected. If the arm has busted off, there is a 'Mixer flap arm repair kit' available from the dealer for about $8.
As to no heat, I'm agreeing with nate. There is NO valve to the heater core - it gets full flow all the time. So if you aren't getting heat to the heater core, it is either (1) a core blockage, or (2) a thermostat problem. A core blockage could be due to freezing up, very possible in very cold weather and weak antifreeze. As to the thermostat problem, the thermostat has three positions, and will actually block off the heater core if the temp gets too high. Now, this isn't the case in winter, but if the thermostat gets stuck that way, you'll get little or no heater core flow. However, this would show up as a VERY slow to heat up car, and I doubt you'd see 1/2 on the gauge in winter. So a thermostat problem is remote, but I feel compelled to mention it. A frozen heater core will thaw after a while (30 minutes? More?). Have your anti-freeze checked for freezing point.
posted by 192.249....
, Wed, 8 Jan 2003 10:30:54 <-- Viewing This Message
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